Damper-controller.



No. 697,705. Patented Apr. l5, I902.

D. H. DARRIN.

DAMPER CONTROLLER.

(Application filed Jan. 12, 1898.) H (No Model.) 3 Sheets-Sheet I.

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No. 697,705. Patented Apr. |5, I902.

n. H. DARRIN.

DAMPER CONTROLLER.

(Application filed Jan. 12, 1898.) (No Model.)

3 Sheets-Sheet 2.

WITNESSES:

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no; 697,705. Patented Apr. l5, I902.

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DAMPER BUNTRULLER.

(Application filed Jan. 12, 1898.) (No Model.) 3 Sheets-Sheet 3.

Uni'rnn STATES ATENT OFFICE.

DAVID H. DARRIN, OF ORANFORD, NEWV JERSEY, ASSIGNOR TO EMBURX MCLEAN, OF BROOKLYN, NEW YORK.

DAM PER-CONTROLLER.

$PEGIFICATION forming part of Letters Patent No. 697,705, dated April. 15, 1902.

Application filed January 12,1898. Serial No. 666,472. (No model.)

To all whom it may concern:

Be it known that 1, DAVID H. DARRIN, a citizen of the United States, residing at Oranford, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Damper-Controllers, of which the following is a specification.

This invention consists of an improved apparatus for controlling or regulating the damto per of a steam-boiler actuated by a fluid medium derived from an independent source of supply and governed by the steam in the boiler, combined with means connected to the door of the furnace to cause the damper-mo- 1 I5 tor to fully close the damper when the furnace-door is opened, thus preventing at such times air entering the furnace or being drawn therein and through the fiues of the boiler by the draft of the stack.

.20 An apparatus suitable for the purpose of this invention to control the damper, so as to close it to a fixed extent and to open it within narrow pressure limits at or about the desired normal working pressure of the steam in the boiler, comprises a fluid-pressure motor connected to the damper, so as to hold it open when the motor is influenced by a fluid under pressure and to close the damper when it is relieved of the pressure, an independent source of fluid-pressure supply, a relay device for directing the fluid to and from the damper-motor, and a governor actuated by steam from the boiler to set the relay in action by means of the fluid-controlling medium.

The means for causing the damper to be closed when the furnace-door is open consists of a three-way valve in the supply-pipe from the relay to the damper-motor so connected to the furnace-door that the supply- 0 pipe is unobstructed when the door is closed and is closed to cut off the supply of fluid from the relay and the vent opened to allow the fluid to discharge from the damper-motor when the door is open, the connection be- 5 ing of such a character that this three-way valve is operated to its full extent to allow the damper to be fully closed during a small movement of the door at the commencement of its opening, thus quickly cutting off all draft efiects of the stack on the furnace,

and to close the vent and open communication between the relay and the damper-motor to cause the damper to be fully opened during the last portion of the closing movement of the furnace-door.

The accompanying drawings, forming part of this specification, illustrate my invention, and to them I will now refer to more fully describe the same.

Figure 1 represents the front of a vsteam- 6o boiler,showing my damper apparatus applied thereto, the parts being conventionally arranged for perspicuity of description. Fig.

2 shows the damper, its motor, the door-actuated valve, and some of the pipe connections in sections. Fig. 3 is a vertical section of the governor. Fig. at is a cross-section of the upper part of the same, taken on line 4 4. Fig. 5 is a vertical section of the relay. Fig.

6 is a cross'section of the same, taken on line 7o 6 6; and Fig. 7, a general view, on an enlarged scale, of theregulating apparatus with the covers of the casings removed.

The drawing Fig. 1 shows the front A of a boiler, its furnace-door A, and smoke-stack A In the stack is located a damper B, an arm from which is connected to the lever C of the motor O, the diaphragm O of which is joined to and acts on the lever C. These parts are of ordinary construction.

The governor D here shown comprises a diaphragm-covered chamber D, placed in communication with the steam-space of the boiler by the pipe D a spring-actuated lever D resting against the diaphragm, a sup- 8 5 ply and vent valve E, the moving part of which seats against the opening E when in one position and against a seat E to close the space which forms the vent around the freefitting stem of the valve when in the other position, a spring-controlled lever F, operating the valve E and carried by'the pivoted arm F, which is connected to the diaphragm of the chamber G. This chamber has an outlet-orifice closed by a seat on the spring 5 actuated lever G. A branch from the supply-pipe H of the air-reservoir H connects with the supply end H of the case of the valve E and is also in communication with the chamber G through the small orifice G rco which is considerably smaller than the outlet of this chamber, which is covered by the lar to the valve E.

valve-seat on the lever G. The reservoir H is supplied with compressed air from the compressor H which may be actuated from any suitable source of power. The relay I is also provided with a supply and vent valve J, having two seats J and J and a vent simi- It is operated by the lever K and arm K, which in turn is connected to and operated by the diaphragm of the chamber L in like manner to the lever F, arm F,and chamber G. This chamber L of the relay has one opening only, by which the chamber and said outlet ,part E of the case of the supplyand vent valveE are connectedthrough the pipe L- The pivoted arm F of the governor and the pivoted arm K of the relay are provided with adjustable stop devices F and K respectively, to provide means for the limitation of their forward and backward movement. The fiuid-pressure-supply pipe H connects with the inlet end H of the case of the valve J of the relay, and from the outlet end J of this case extends the pipe M to the motor 0 of the damper B. A part of this pipe M is arranged in front of the boiler, and in this part of the pipe, in proximity to the furnace-door A, is located the cut-off and vent valve N. This is shown as a three-way plug-valve with a vent-hole in its side, the plug being provided with an arm or lever N,

between the end of which and the furnace door A is fastened a chain 0, and to the arm on its opposite side is attached the spring 0, which by its resilience when the door A is opened turns the plug to close the passage of the 'pipe'M and open the chamber 0 of the damper-motor C to the atmosphere. through the vent-opening in the side of the valve N.

The movement of the end of the arm N of this valve is much less than that part of the door A to which the chain 0 is attached, so upon opening the door the valve is actuated to its fullest extent by the spring 0 when the door is only partly opened, a full swing of the door causing the chain to hang in a slack loop. This vents the damper-motor quickly and allows the damper B to close the stack opening before the furnace door is fully opened. The reverse of the actions and movements occur when the furnace-door is closed. The spring acting on the lever D- of the diaphragm of the chamber D is provided with means for its adjustment, by which the opposition to the movement of thediaphragm may be regulated to accord with the desired steam-pressure to be maintained, and this means consists of a screw D arranged to opsure of steam in the boiler is sufficient to force out the diaphragm of the chamber D of the governor against the resistance of the ad justable spring of the lever D said lever presses against the lever G,which exposes the outletorifice of the chamber G and allows the air to escape therefrom, so that the diaphragm collapses, and the valve E is moved away from the seat E and against the seat E as shown in Fig. 4:. Air now flows from the pipe H through the parts 11 and E of the case of the valve E and the pipe L to the chamber L of the relay I, therebyforcing out its diaphragm, which acts through the medium of the arm K and lever K to close the valve J against the seat J, thus cutting oft the air-supply from the pipe M and allowing the air that is in the chamber C of the damper-motor O to escape from the vent around the stem of the valve J. The diaphragm of said motor 0 now collapses, and the damper B is moved to close the flue or smoke-stack A thus reducing the intensity of the fire in the furnace. Upon a slight reduction of steam-pressure the diaphragm of the chamber D is collapsed by the action of the spring of the lever D and the parts of the governor again assume the positions they occupy in Fig. The air-supply is thus cut oif from the chamber L, allowing the parts of the relay to again resume the positions shown at Figs. 5 and 6 and air to again flow from the pipe H to the damper-motor 0 through the parts H and J 3 of the case of the valve J and the pipe M, thus causing the damper B to be again opened. Now, as before described, every time that the furnacedoor A is opened the chamber of the dampermotor C is-by the action of the valve N cut off from the source of fluid-pressure, the fluid in the chamber allowed to escape, and the damper B to be closed. Thus by the addition of a simple device to a damper-regulator which is actuated by a controlling fluid medium the discharge of heated gases from or the entrance of air to the furnace when the furnace-door is open is entirely avoided, and it is evident that such advantageous effects will be produced by this device whether other means than steam-pressure be employed to govern the fluid-medium-controlling devices of the damper-regulator. The boxes or casings of the two membersD andIare provided with apertures ac to relieve the internal pressure due to such compressed air as may escape or be discharged into them.

I claim as my invention- 1. The combination with a damper-regulator for boiler-furnaces controlled by variations of pressure of the steam in the boiler, through the medium of a damper-motor, actuated by a fluid under pressure to hold the damper open, of the furnace-door and a cutoff and vent device so connected to and operated by the furnace-door as to cut off the controlling fluid medium from the dampen doordamper controller, consisting of a damper-motor connected to the damper and actuated by a fluid under pressure, a controlling device actuated by changes in the material being heated by the furnace to allow the fluid under pressure to pass to the dampermotor and to vent the same, a reservoir for such fluid under pressure, pipes connecting the source of fluid-supply the controlling device and the damper-motor, a cut-0E and vent valve in the supply-pipe to the damper-motor, and means connecting the cut-off and valve and the furnace-door whereby the fluid is cut ofi from and the damper-motor vented when the furnace-door is open and when the boiler-pressure is above the normal.

3. A combined steam-boiler pressure and furnace-door-damper controller, comprising a damper-motor, a source of fluid-pressure supply for actuating the damper-motor, to hold the damper open, a controlling device, comprising a governor and a relay, said governor being actuated by steam from the boiler to allow the fluid under pressure to actuate the relay to cause it'to allow the fluid under pressure to pass to the damper-motor and to allow the fluid to escape from the dampermotor when the pressure of the steam rises, pipes connecting the source of fluid-supply, the controlling device and the damper-motor,

a cut-01f and vent device located in the supply-pipe to the damper-motor, and a connectionbetween the furnace-door and the cutoff and vent-valve whereby said valve is closed and its vent opened during the initial opening of the door.

4. In a steam-boiler furnace,'the combination of the smoke-stack damper, a motor controlling the damper, means for controlling the motor operated by the boiler-pressure and means for controlling the motor operated by the furnace-door to cause the closing of the damper when the steam-pressure rises above a predetermined point or when the furnacedoor is opened, and to cause the opening of the damper when the boiler-pressure is normal or less than normal and the furnace-door is closed. 4

5. In a steam-boiler furnace, the combina means for controlling the motor actuated by the furnace-door.

' In testimony whereof I have hereunto subscribed my name.

DAVID D RRIN'.

Witnesses:

FRANK S. OBER, I ALFRED SHED'LOCK; 

